Preparation and use methods of coating material for seawater desalination reaction kettle

A reaction kettle and deionized water technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve problems such as reaction kettle damage, avoid environmental pollution, simplify process flow, and reduce the use of drugs.

Pending Publication Date: 2021-07-13
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the biggest problem faced in the process of front-end intervention is that the pumping of concentrated seawater into the reactor can easily cause damage to the reactor

Method used

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  • Preparation and use methods of coating material for seawater desalination reaction kettle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Synthesis of a reversible polymer material complexing metal ions, polyacrylic acid-polyfurfuryl alcohol interpenetrating network:

[0030] A. Synthesis of furfuryl alcohol resin (PFA): Add 100 g of furfuryl alcohol into a round bottom flask, add 20 ml of deionized water, heat and stir under nitrogen atmosphere, control the temperature at 60° C., and react for 30 minutes. Subsequently, 5ml of concentrated sulfuric acid was diluted to 30ml, gradually added dropwise to the flask, controlled temperature at 70-80°C, reacted for 2 hours, cooled to room temperature, added ammonia water to adjust the pH to neutral, the product was centrifuged, and vacuum-dried overnight.

[0031] B. Synthesis of polyacrylic acid (PAA): Add 1g of acrylic acid to a round bottom flask, add 100ml of deionized water, heat and stir under nitrogen atmosphere, control the temperature at 75°C, react for 30 minutes, drop 20g of acrylic acid and equivalent ammonium persulfate respectively into the reactio...

Embodiment 2

[0035] The influence of concentrated seawater quality on the removal rate of high-valent cations such as calcium and magnesium was further analyzed; the influence of supersaturation and pH value on the grain shape, formation speed, yield and purity of ammonium magnesium phosphate were analyzed:

[0036] A. Supersaturation: When the supersaturation of the reaction is between 1 and 5, the removal rate of phosphate and the formation of magnesium ammonium phosphate crystals can reach the best;

[0037] B. pH value: According to the experimental results and theoretical analysis, a large amount of struvite is formed between the pH value of 8.0 and 10.0, and the purity is relatively high;

[0038] C. Ratio of crystal ions: Mg 2+ , NH 4 + ,PO 4 3- The stoichiometric ratio of the three reacting to form struvite is 1:1:1, NH 4 + When the remaining mass concentration is between 30 and 80 mg / L, the purity is the highest. Mg 2+ PO 4 3- When the molar ratio of substances is greate...

Embodiment 3

[0042] Put the coating sample plates produced in Examples 1 and 2 and the comparative steel plates in a beaker filled with concentrated seawater concentrated by 10 times the volume of seawater to carry out the aging test. After 30 days, it turned out that the coated steel plate had no obvious change and had better stability.

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Abstract

The invention relates to preparation and use methods of a coating material for a seawater desalination reaction kettle, in particular to a coating material for the seawater desalination reaction kettle, and belongs to the technical field of seawater desalination. The method comprises the following steps: synthesizing a polyacrylic acid-polyfurfuryl alcohol interpenetrating network, and preparing the coating. The coating material has the beneficial effects that the coating material is bonded with effective functional groups to assist in treating the concentrated seawater, and an unrecyclable EWT reagent is effectively replaced, so that the process flow is simplified, and the use of drugs is reduced, the metal inner wall of the reaction kettle is protected from electrochemical corrosion, and struvite production is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a method for manufacturing a polymer coating material. The polymer material can be applied to the lining coating of the reaction kettle in the process of seawater desalination struvite extraction and the filling material of the reaction packed column. Background technique [0002] Magnesium ammonium phosphate, commonly known as struvite, the molecular formula is MgNH 4 PO 4 ·6H 2 O is an amorphous precipitate, only slightly soluble in water, and its nutrient release rate is slower than other soluble fertilizers, so it can be used as a slow-release fertilizer. [0003] Concentrated seawater is one of the raw materials needed to produce high-quality struvite. Using seawater desalination concentrated seawater and ammonium phosphate solution as the main raw materials, adding chemical reagents to produce magnesium ammonium phosphate slow-release fertilizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D161/00C09D133/02C09D163/00C09D7/65C01B25/45B01J19/02B01D19/04
CPCB01D19/0409B01J19/02B01J2219/0245C01B25/451C08K2003/2241C08K2003/3045C08L2205/04C09D161/00C09D7/65C08L33/02C08L63/00C08L83/04C08L83/06C08K3/22C08K3/30
Inventor 徐世凯王晓刚阮仕平杨彦于璐郭风张睿程锐李昂王彤彤陈健王勇赵金箫祝龙武秀侠丁文浩董波杨宇周杰
Owner NANJING HYDRAULIC RES INST
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